dhcpv6: T3771: Allow installation of routes for delegated prefixes

1 files changed, 78 insertions, 0 deletions

diff --git a/src/system/on-dhcpv6-event.sh b/src/system/on-dhcpv6-event.sh
new file mode 100755
index 000000000..fcc88ae6f
--- /dev/null
+++ b/src/system/on-dhcpv6-event.sh
@@ -0,0 +1,78 @@
+#!/bin/bash
+#
+# Copyright (C) 2024 VyOS maintainers and contributors
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 or later as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+#
+
+if [ $# -lt 1 ]; then
+  echo Invalid args
+  logger -s -t on-dhcpv6-event "Invalid args \"$@\""
+  exit 1
+fi
+
+action=$1
+
+case "$action" in
+  lease6_renew|lease6_recover)
+    exit 0
+    ;;
+
+  lease6_release|lease6_expire|lease6_decline)
+    ifname=$QUERY6_IFACE_NAME
+    client_ip=$LEASE6_ADDRESS
+    client_prefix_len=$LEASE6_PREFIX_LEN
+
+    if [[ "$LEASE6_TYPE" != "IA_PD" ]]; then
+      exit 0
+    fi
+
+    sudo -n /sbin/ip -6 route del ${client_ip}/${client_prefix_len} \
+      dev ${ifname} \
+      proto static
+
+    exit 0
+    ;;
+
+  leases6_committed)
+    for ((i = 0; i < $LEASES6_SIZE; i++)); do
+      ifname=$QUERY6_IFACE_NAME
+      requester_link_local=$QUERY6_REMOTE_ADDR
+      client_type_var="LEASES6_AT${i}_TYPE"
+      client_ip_var="LEASES6_AT${i}_ADDRESS"
+      client_prefix_len_var="LEASES6_AT${i}_PREFIX_LEN"
+
+      client_type=${!client_type_var}
+
+      if [[ "$client_type" != "IA_PD" ]]; then
+        continue
+      fi
+
+      client_ip=${!client_ip_var}
+      client_prefix_len=${!client_prefix_len_var}
+      
+      sudo -n /sbin/ip -6 route replace ${client_ip}/${client_prefix_len} \
+        via ${requester_link_local} \
+        dev ${ifname} \
+        proto static
+    done
+
+    exit 0
+    ;;
+
+  *)
+    logger -s -t on-dhcpv6-event "Invalid command \"$1\""
+    exit 1
+    ;;
+esac